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Loans Receivable - Troubled Debt Restructurings (Details) $ in Thousands	3 Months Ended		9 Months Ended
	Jun. 30, 2019 USD ($) contract	Jun. 30, 2018 USD ($) contract	Jun. 30, 2019 USD ($) contract	Jun. 30, 2018 USD ($) contract
Accounts, Notes, Loans and Financing Receivable [Line Items]
Number of Contracts | contract	3	6	7	29
Pre-Modification Outstanding Recorded Investment	$ 619	$ 789	$ 982	$ 12,240
Post-Modification Outstanding Recorded Investment	$ 619	$ 789	$ 982	$ 12,240
Single-family residential
Accounts, Notes, Loans and Financing Receivable [Line Items]
Number of Contracts | contract	3	5	6	25
Pre-Modification Outstanding Recorded Investment	$ 619	$ 714	$ 942	$ 4,909
Post-Modification Outstanding Recorded Investment	$ 619	$ 714	$ 942	$ 4,909
Land - consumer lot loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Number of Contracts | contract			1	0
Pre-Modification Outstanding Recorded Investment			$ 40	$ 0
Post-Modification Outstanding Recorded Investment			$ 40	$ 0
Commercial & industrial
Accounts, Notes, Loans and Financing Receivable [Line Items]
Number of Contracts | contract			0	3
Pre-Modification Outstanding Recorded Investment			$ 0	$ 7,256
Post-Modification Outstanding Recorded Investment			$ 0	$ 7,256
HELOC
Accounts, Notes, Loans and Financing Receivable [Line Items]
Number of Contracts | contract	0	1	0	1
Pre-Modification Outstanding Recorded Investment	$ 0	$ 75	$ 0	$ 75
Post-Modification Outstanding Recorded Investment	$ 0	$ 75	$ 0	$ 75

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Number of financing receivables that have been modified by troubled debt restructurings.

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
-SubTopic 10
-Section 50
-Paragraph 33
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Post-modification amount of investment in financing receivables modified by troubled debt restructurings.

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